SN74ALS644AN

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS644AN is an octal bus transceiver from Texas Instruments, part of the ALS logic series. It features eight bidirectional data paths with three-state outputs, enabling efficient data transfer between buses. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports TTL input and output levels. Packaged in a PDIP-20 housing, it offers a propagation delay of 10 ns and can drive loads with low-level output currents up to 24 mA. Designed for industrial temperature ranges from 0°C to +70°C, this component facilitates reliable digital signal routing in complex electronic systems.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Provides eight bidirectional data paths for efficient bus interfacing
• Features three-state outputs to prevent bus contention during inactive states
• Supports TTL-compatible input and output voltage levels
• Operates reliably across standard industrial temperature ranges

Buffers, Drivers, Receivers, Transceivers Applications

• Bidirectional data bus buffering and driving
• Memory-to-memory or memory-to-I/O data transfers
• Bus-oriented architectures requiring isolation
• Digital communication interfaces

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'AN' confirms the PDIP-20 package and commercial/industrial temperature grade. Confirm RoHS compliance status through official documentation as requirements vary by manufacturing date code. Check for end-of-life notices or obsolescence warnings directly from Texas Instruments before finalizing procurement plans.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when designing systems requiring high-speed octal data transfer with bus isolation. Ensure the application voltage remains strictly within the 4.5 V to 5.5 V range to maintain timing specifications. Verify that the required drive current does not exceed the specified 24 mA low-level output capability. Consider thermal dissipation requirements if operating at maximum ambient temperatures.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN74ALS family, known for advanced low-power Schottky technology. It serves as a critical interface element in legacy and modern digital designs needing robust bus management. The octal configuration reduces component count compared to using multiple single-bit transceivers, simplifying PCB layout and design complexity.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Compatible substitutes include the SN74LS644N for lower speed applications and other ALS-series octal transceivers. Verify pin compatibility and electrical characteristics such as propagation delay and output drive strength before substitution.